PHILOSOPHICAL 
TRANSACTIONS. 
I. Account of experiments made with an invariable pendulurti at 
the Royal Observatory at Greenwich , and at Port Bowen , on 
the eastern side of Prince Regent's Inlet . By Lieutenant 
Henry Foster, R. N. F. R. S. 
Read April 6, 1826. 
The determination of the length of the seconds’ pendulum 
in different latitudes, is a subject, that has long been consi- 
dered of much interest and importance, but more especially 
of late years, since the practical problem has received from 
the ingenuity of Captain Henry Kater, certain improvements 
and simplifications, which have rendered its results more 
accurate than had ever before been obtained. 
With the nature of these improvements I had already be- 
come acquainted when in H. M. S. Conway, with Captain 
Basil Hall, on the South American station, where, as will 
be seen in the Philosophical Transactions for 1823, several 
series of experiments were made by that officer and myself. 
Soon after my appointment to the N. W. Expedition under 
the command of Captain W. E. Parry, the Board of Longi- 
tude, at the suggestion of Captain Kater, did me the honour 
mdcccxxvi. * B 
